Earth

In this image, we are looking at a volume of space 100 000 km on a
side. The Moon, about 1/4th the diameter of Earth, is 30 cm away at
this scale. We are viewing the Earth from a point half the distance
to our Moon. We are far above the orbiting geosynchronous satellites
that provide nearly instantaneous global communication. A geosynchronous
satellite orbits at an altitude of roughly 40 000 km above the equator
so that the satellite's orbital velocity keeps it always directly above
the same point on the Earth's surface. Science fiction and non-fiction
author Arthur C. Clark was the first to suggest the importance of the
geosynchronous orbit for communication.